feat: Jan adding google API

[Realmbird]

Problem
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Jan only supports openai compatible api. So using https://github.com/zhu327/gemini-openai-proxy/tree/main will convert openai protocol to Gemni

Success Criteria
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Additional context
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[Realmbird]

I will try working on this

[Realmbird]

Attempting to use https://github.com/janhq/jan/blob/dev/extensions/inference-anthropic-extension/src/index.ts claude transformation to work for gemni

[holtskinner]

Note: you might be able to use this new feature for accessing Gemini on Vertex AI through the Open AI API

https://cloud.google.com/vertex-ai/generative-ai/docs/multimodal/call-gemini-using-openai-library

[Realmbird]

ok

[imtuyethan]

@Realmbird How is it going for you